JPS4927688

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DESCRIPTION JPS4927688
■ Cartridge (E) Application No. 45-58641 [phase] Application No. 44 (1969) September 9 0
Japanese Patent Application No. 44-71524 Division 0 Inventors for the present invention
Kamiyoi 0 Applicant Sony Corporation Tokyo Parts Division North 6 7 35 [stock] agent patent
attorney Atsushi Ito
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view from below showing an
example of a cartridge according to the present invention, FIG. 2 is a cross sectional view thereof,
FIG. 3 is a cross sectional view showing the main part of the present invention, and FIG. FIG. 5 is
a cross-sectional view similar to FIG. 3 for describing the present invention, and FIG. 6 is a curve
diagram showing the characteristics of the resonance phenomenon.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cartridge for
reproducing signals from a record using an electrostatic mechanical-electrical converter. The
cartridge according to the present invention will now be described with reference to the
drawings with reference to the drawings. The cartridge of the present invention 4 + 4 comprises
a main body 2 incorporating, for example, two conversion devices 1 for converting air vibration
into electrical signals; On the other hand, the head portion 3 is formed detachably. The main
body 2 accommodates two conversion devices 1 and an amplification portion 6 for amplifying
the electric signal obtained from the conversion devices 1 in a shield case 5 attached to one
surface, for example, the lower surface of the bracket 4. Diaphragm (main vibration as shown in
FIG. 3 and FIG. 3) in which a recess 9 is formed on the back surface 8a of the front plate or
substrate 7 as the main body 2 and the outer periphery thereof is fixed by the frame 10Fc. The
plate 11 is accommodated with the frame 10 forward and is accommodated [111111], and the
back plate (back electrode) 12 is accommodated via the spacer 13 so as to be opposed to the
main diaphragm 11. In this case, a first air chamber 14 is formed between the main diaphragm
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11 and the substrate 7, and a second air chamber 15 is formed between the main diaphragm 11
and the back electrode 12. The distance between the back electrode 12 and the main diaphragm
11 is relatively narrow, for example, about 20 to 30 μ. ,. If the distance between the main
diaphragm 11 and the back electrode 12 is narrowed, the sensitivity is increased, but if it is
narrowed too much, the air viscosity resistance becomes too large and the sensitivity is lowered.
In order to prevent this, for example, it is possible to make a large number of pores 16a in the
back electrode 12 substantially at each balance, thereby reducing the viscous resistance and
improving the sensitivity. A conductive film is deposited on the side, and the back electrode 12 is
formed of a conductive material, from which the output terminal 18 of the electrical signal is
derived. Incidentally, the main diaphragm 11 may be set to a permanent charge as is generally
known. The electric signal thus obtained at the output terminal 18 is supplied to the amplifier 6.
Of course, two amplifiers 7 are provided corresponding to the two conversion devices 2
respectively. The main diaphragm 11 can be formed of a polymer film, and the back electrode 12
can be formed of an acrylic resin. In this case, a conductive film may be deposited on the main
diaphragm 11 side. The output signal from such an amplifier 6 is led out at the terminal plate 19.
Further, a protrusion 17 having a through hole 16 passing through the first air chamber 14
described above is formed on the front of the substrate 4. In this case, the projecting portion 17
is tapered as shown in FIGS. Further, the above-mentioned head portion 3 is mounted on the base
4 so as to be fitted to the projecting portion 17.
The head portion 3 comprises a stylus device 20, an elastic material having flexibility and
elasticity such as a bellows 21 and a support 22 for holding them in a predetermined
relationship. The stylus device 20 is configured as shown in FIG. That is, an arm mounting
portion 25 to which a styler [111111] EndPage: 1 swing arm 24 having a stylus 23 fitted is
attached, and a fixing portion mounting provided on the opposite side of the mounting portion
25 to the arm 24 is a portion 26; The arm attachment is constituted by a portion 25 and the
fixing portion attachment is constituted by a coupling portion 2T which mechanically couples the
portion 26 to each other. The stylus arm 24 is made of, for example, a piano wire having a
hollow, and one end of the arm 24 is a hollow attachment, for example, made of resin such as
polyethylene, polypropylene, etc. Insert into 25. In fitting the parts together, k may be formed by
roughening the inner surface of the cylinder of the mounting portion 25 and adhering and
bonding it with an epoxy adhesive, or may be simply press-fitted. Thus, the connecting portion
2T described above is formed along the axis O-.sigma. So that the heel also approaches the axis
0-0 'as it approaches the central portion of the connecting portion 21, that is, it is formed into a
mountain ridge. The cross-sectional area of the central portion of the arm mounting portion 25 is
formed so as to be extremely small as compared with that of the arm mounting portion 25.
Further, as shown in FIG. 4, the arm mounting portion 25 is formed of the same exciting resin as
the excitation arms 28 and 29 described above, but the angle of each of the excitation arms 28
and 29 is the axis o-o '. They are formed maintaining equal angular intervals of 45 ° with
respect to the vertical direction. In this case, it will be apparent that two excitation arms 28 and
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29 are provided and used for stereo, but one excitation arm 2g, 29 can be applied for monaural
use. The arm attachment portion 25, the fixing portion 26, the coupling portion 27, and the
excitation arms 28 and 29 can be integrally formed with each other. Further, the fixing portion
attaching portion 26 is provided with a taper 30 on the opposite side to the connecting portion
27 so that flexible, for example, rubber 1131 can be inserted into the outer periphery of the
connecting portion 2T. As clearly shown in FIG. 2, the support 22 has an inward projecting
projection 32 at the point of contact with the substrate T, and the inside of this projection 32 has
a through hole 33 and the inside thereof. The bellows 21 and the fixing portion 26 of the stylus
device 20 are sandwiched and stored, and the arm 24 of the stylus device 20 is made to project
outward of the head portion 3. Further, as shown in FIG. 2, the bellows 21 has a cylindrical
shape, one end of which is closed, and the inner surface of the open end of the other end is
tapered corresponding to the projecting portion 17 of the main body 2.
The bellows 21 is formed of a flexible material such as rubber. Thus, the W1111111 stylus
device 20 is completely mounted such that the excitation arms 28 and 29 described above abut
the closed end of the bellows 21. If the head portion 3 is fitted to the main body 2 so as to hold
the protrusion 1T in the opening 34 of the bellows 21 in a predetermined relationship, the inner
surface of the opening 3.4 of the bellows 21 is completely and surely The third air chamber 35
(hollow portion) can be formed to be in close contact with the projection 1T, and thus the
projection 11 and the bellows 21 communicate with the first air chamber 14. In addition, in
order to prevent the entry of dust or the like between the support 22 and the stylus device 20,
the cover 36 may be provided. A through hole 38 is bored in the plate portion 37 in the main
body 2 engaged with the head portion 3 described above, and a through hole 39 is bored in the
support 22 so as to communicate with the through hole 38 described above. The head portion 3
is attached to the main body 2 by screws 40 passing therethrough. Accordingly, the head portion
3 can be detachably mounted via the screw 40. In the illustrated example, the plate portion 3T is
attached to the front surface of the substrate 7 of the main body 2, the upper surface of the
projecting portion 1T of the head portion 3 is turned on the lower surface 41, and the head
portion 3 is attached to the main body 2 Thus, the opening 34 of the bellows 21 of the head
portion 3 can be fitted exactly to the projection 17 of the main body 2. According to the cartridge
thus configured, the mechanical vibration of the stylus 23 is transmitted to the excitation arm H,
29, and is also transmitted into the first air chamber 14 through the bellows 21, so that the main
diaphragm 11 vibrates by this. Accordingly, the capacitance between the conductive film of the
second air chamber 15 and the back electrode 12 changes with the vibration of the main
diaphragm 11, so that the mechanical vibration can be converted into an electric signal and can
be taken out from the output terminal 14. In this way, mechanical vibration is converted into an
electrical signal and taken out, but when the vibration is transmitted through the through hole
16 of the protrusion 1T, resonance occurs in the through hole 16 if the vibration exceeds a
certain frequency. It was confirmed that the phenomenon occurred. The frequency at which the
resonance phenomenon occurs differs depending on the diameter of the through hole 16 of the
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projection 17 and the length thereof, but in the configuration of the projection 17 as in this
embodiment, the vibration frequency is 10 KF as shown by the curve 45 in FIG. A resonance
phenomenon appears near the brow. Therefore, in the cartridge where such a resonance
phenomenon occurs, the signal from the record can not be reproduced accurately. In the present
invention, the acoustic resistor 46 is inserted into the air vibration passage of the projecting
portion 17, ie, the through hole 16 in consideration of the above point, and the action of the
acoustic resistor 46 causes the acoustic resistor 46 to be inserted into the through hole 16. It is
to avoid the resonance phenomenon.
That is, for example, as shown in FIG. 3, for example, cotton, which is to be the acoustic resistor
46, is inserted over substantially the entire area of the through hole 16 of the protrusion 17. In
this case, the proper insertion position of the acoustic resistor 46 is determined in advance so
that the acoustic resistor 46 does not protrude from the rear end of the protrusion 17 and hence
the open end 47 communicating with the first air chamber 14 and does not face the open end
47. Insert into . In the cartridge using the acoustic resistor 46 inserted at such a position, as
shown by a curve 481ic in FIG. 6, the resonance is completely blocked over substantially the
entire use frequency. 挿入 When this acoustic resistor 46 is inserted, whether or not the
resonance phenomenon can be completely avoided is determined by the insertion position of the
acoustic resistor 46, and it is substantially in the entire area of the through hole 16 (insertion
position A in FIG. 3). When it is inserted at the rear end of the through hole 16, that is, at the
position B near the first air chamber 14 shown in FIG. 5, the resonance daily report as shown in
FIG. 6 curve 49 is obtained. Although the problem is not so serious, a slight resonance
phenomenon tends to occur when the frequency passing through the through hole 16 is in the
vicinity of the high frequency region 20 KH2. Also, in FIG. 5, when the resistor 46 is inserted in
the vicinity C of the tip of the projection 17, as shown in the curve 50 of FIG. 6, the resonance
phenomenon is largely performed compared to the case where the resistor 46 is not inserted. It
can be diminished. When the resistor 46 is inserted at a position other than the above B and C,
that is, near the center along the longitudinal direction of the bellows 21, the resonance
phenomenon can be almost avoided as shown by the curve 51, although the resistor 46 can be
avoided. There is a tendency for the insertion effect of The resonance phenomenon can be
reduced at any position of <B, C and D as clearly seen from the binary curve 49, 50 and 51, but it
is possible to insert the acoustic resistor 46 at the position A. As described above, according to
the present invention, it has a feature that can be extremely effectively avoided by the simple
configuration over the resonance phenomenon that occurs when passing through the throughhole 16 of the projecting portion 17, and therefore the record gear is reproduced. Can do well. It
will be appreciated that the acoustic resistor 46 is not limited to cotton, but may be a breathable
resistor, such as a foam material.
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